Navigation Links
Counting the twists in a helical light beam
Date:1/8/2013

Cambridge, Mass. - January 8, 2013 - At a time when communication networks are scrambling for ways to transmit more data over limited bandwidth, a type of twisted light wave is gaining new attention. Called an optical vortex or vortex beam, this complex beam resembles a corkscrew, with waves that rotate as they travel.

Now, applied physicists at the Harvard School of Engineering and Applied Sciences (SEAS) have created a new device that enables a conventional optical detector (which would normally only measure the light's intensity) to pick up on that rotation.

The device, described in the journal Nature Communications, has the potential to add capacity to future optical communications networks.

"Sophisticated optical detectors for vortex beams have been developed before, but they have always been complex, expensive, and bulky," says principal investigator Federico Capasso, Robert L. Wallace Professor of Applied Physics and Vinton Hayes Senior Research Fellow in Electrical Engineering.

In contrast, the new device simply adds a metallic pattern to the window of a commercially available, low-cost photodetector. Each pattern is designed to couple with a particular type of incoming vortex beam by matching its orbital angular momentumthe number of twists per wavelength in an optical vortex.

Sensitive to the beam's "twistiness," this new detector can effectively distinguish between different types of vortex beams. Existing communications systems maximize bandwidth by sending many messages simultaneously, each a fraction of a wavelength apart; this is known as wavelength division multiplexing. Vortex beams can add an additional level of multiplexing and therefore should expand the capacity of these systems.

"In recent years, researchers have come to realize that there is a limit to the information transfer rate of about 100 terabits per second per fiber for communication systems that use wavelength divisio
'/>"/>

Contact: Caroline Perry
cperry@seas.harvard.edu
617-496-1351
Harvard University
Source:Eurekalert  

Page: 1 2 3

Related biology technology :

1. 2011 ErgoExpo Attendees Choice Award Winners Announced During Sold Out Expo; Exhibitor Renewal for 2012 Hits 96% and Counting
2. Sequenom Announces Appointment of Carolyn Beaver to Chief Accounting Officer
3. NASA develops super-black material that absorbs light across multiple wavelength bands
4. A light wave of innovation to advance solar energy
5. The Foremost Expert on Morgellons Disease Highlights the Gravity of This Illness
6. BioSpace Spotlights Northwests Life Science Community
7. Multidisciplinary team of researchers develop world’s lightest material
8. Blocked holes can enhance rather than stop light going through
9. Novartis Highlights Advances for Patients With Breast Cancer and Hematological Diseases With Over 160 SABCS and ASH Abstracts
10. New 3-D transistors promising future chips, lighter laptops
11. Sheffield scientists shine a light on the detection of bacterial infection
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Counting the twists in a helical light beam
(Date:7/29/2015)... , July 30, 2015 ... santé, publie ses résultats pour le premier semestre ... commente les résultats. Visionner l,interview vidéo ... http://www.eurobusinessmedia.com/ceo-direct/sanofi/sanofi-h1-2015-results-interview-with-ceo-olivier-brandicourt?utm_source=ceo-direct&utm_medium=wire Au sommaire de l,interview ... - Moteurs de croissance - Diabète ...
(Date:7/29/2015)... July 29, 2015  HealthSouth Corporation (NYSE: ... providers of post-acute healthcare services, offering both facility-based ... of operations for the second quarter ended June 30, ... characterized by strong volume growth in both segments ... said Jay Grinney, President and Chief Executive Officer ...
(Date:7/29/2015)... -- AmnioChor Inc., an early stage biotech startup based on ... that the Musculoskeletal Transplant Foundation of Edison ... seed round of development of the proprietary AmnioCept™ product ... AmnioChor,s technology allows cryopreservation of the amniotic membrane ... within those tissues. Amnion is a well-established source of ...
(Date:7/29/2015)... 2015 /PRNewswire/ - RepliCel Life Sciences Inc. (OTCQB: REPCF) ... pleased to announce that the final design specifications ... locked.  Prototypes for industrial and regulatory testing will ... for CE mark clearance to market the injector ... (Photo: http://photos.prnewswire.com/prnh/20150729/248373 )  ...
Breaking Biology Technology:HealthSouth Reports Results for Second Quarter 2015 2HealthSouth Reports Results for Second Quarter 2015 3HealthSouth Reports Results for Second Quarter 2015 4HealthSouth Reports Results for Second Quarter 2015 5HealthSouth Reports Results for Second Quarter 2015 6HealthSouth Reports Results for Second Quarter 2015 7HealthSouth Reports Results for Second Quarter 2015 8HealthSouth Reports Results for Second Quarter 2015 9HealthSouth Reports Results for Second Quarter 2015 10HealthSouth Reports Results for Second Quarter 2015 11HealthSouth Reports Results for Second Quarter 2015 12HealthSouth Reports Results for Second Quarter 2015 13HealthSouth Reports Results for Second Quarter 2015 14HealthSouth Reports Results for Second Quarter 2015 15HealthSouth Reports Results for Second Quarter 2015 16HealthSouth Reports Results for Second Quarter 2015 17HealthSouth Reports Results for Second Quarter 2015 18HealthSouth Reports Results for Second Quarter 2015 19HealthSouth Reports Results for Second Quarter 2015 20HealthSouth Reports Results for Second Quarter 2015 21HealthSouth Reports Results for Second Quarter 2015 22HealthSouth Reports Results for Second Quarter 2015 23HealthSouth Reports Results for Second Quarter 2015 24HealthSouth Reports Results for Second Quarter 2015 25HealthSouth Reports Results for Second Quarter 2015 26HealthSouth Reports Results for Second Quarter 2015 27HealthSouth Reports Results for Second Quarter 2015 28HealthSouth Reports Results for Second Quarter 2015 29HealthSouth Reports Results for Second Quarter 2015 30HealthSouth Reports Results for Second Quarter 2015 31HealthSouth Reports Results for Second Quarter 2015 32HealthSouth Reports Results for Second Quarter 2015 33HealthSouth Reports Results for Second Quarter 2015 34HealthSouth Reports Results for Second Quarter 2015 35HealthSouth Reports Results for Second Quarter 2015 36
... appeals to the Senate Judiciary Committee for a hearing regarding covert surveillance ... it were not for the fact that real people are being victimized ... ... Ohio (PRWEB) June 24, 2008 -- As the issue of torturing foreign ...
... -. deCODE genetics,(Nasdaq: DCGN ) today announced that ... R&D event to be held in New York., ... beginning at,1pm Eastern Time/5pm GMT/6pm British Summer time, at ... to last approximately three and a half,hours. The webcast ...
... June 24 ,WuXi PharmaTech (NYSE: WX ) ... announced,that the two companies have entered into a ... which will provide world-class preclinical,contract research services in ... located in a 323,450 square-foot, purpose-built facility in,Suzhou, ...
Cached Biology Technology:Covert Torture, Surveillance Jeopardizes the Freedom of American Citizens 2Covert Torture, Surveillance Jeopardizes the Freedom of American Citizens 3Covert Torture, Surveillance Jeopardizes the Freedom of American Citizens 4deCODE genetics to Webcast Presentations at Annual R&D Event 2deCODE genetics to Webcast Presentations at Annual R&D Event 3Covance and WuXi PharmaTech to Form a Joint Venture to Provide World-Class Preclinical Services in China 2Covance and WuXi PharmaTech to Form a Joint Venture to Provide World-Class Preclinical Services in China 3Covance and WuXi PharmaTech to Form a Joint Venture to Provide World-Class Preclinical Services in China 4
(Date:7/23/2015)... -- Aware, Inc. (NASDAQ: AWRE ), a leading supplier ... its second quarter ended June 30, 2015.  ... a decrease of 33% compared to $6.8 million in the ... of 2015 was $0.3 million, or $0.01 per diluted share, ... in the same period a year ago.  ...
(Date:7/20/2015)... 20, 2015  Acuity Market Intelligence,s latest research ... of Commerce and Privacy" forecasts that between 2014 ... will be downloaded to smart mobile devices by ... market is projected to generate more than $67.9 ... seven-year forecast period.    "Biometrics is ...
(Date:7/9/2015)... Calif. , July 9, 2015  Unchained ... today announcing its acquisition of Avid Nano. Avid ... light scattering (DLS) systems.    Also ... smallest, fastest and easiest to use protein sizing ... that measures a protein,s hydrodynamic size, size distribution, ...
Breaking Biology News(10 mins):Aware, Inc. Reports Second Quarter 2015 Financial Results 2Aware, Inc. Reports Second Quarter 2015 Financial Results 3Aware, Inc. Reports Second Quarter 2015 Financial Results 4Aware, Inc. Reports Second Quarter 2015 Financial Results 5Aware, Inc. Reports Second Quarter 2015 Financial Results 6Biometrics on Smart Mobile Devices to Redefine Digital Identity with 12.9 Billion Biometric App Downloads between 2014 and 2020 2Unchained Labs just can't get enough, acquires Avid Nano, rocks out the new pUNk! 2
... measly angstrom's difference in diameter is a road-closed sign: ... water-molecule-sized sports car, say scientists at the University of ... a class of proteins that form trans-membrane channels in ... for water movement between the cell and its environment. ...
... management is the key to regulating cell volume says Dutch ... water by the plasma membrane of animal and human cells. ... balance between water uptake and secretion by the cell plasma ... salt concentrations in and around the cell. Exactly how this ...
... Johns Hopkins who has spent nearly three decades studying ... fever warns that the first widespread outbreak of the ... sign of how humans can inadvertently help spread infectious ... to be published in The New England Journal of ...
Cached Biology News:Cells direct membrane traffic by channel width 2Water management in cells 2Infectious disease expert warns of spread of Rocky Mountain spotted fever 2Infectious disease expert warns of spread of Rocky Mountain spotted fever 3
Mouse monoclonal antibody raised against a partial recombinant CRKRS. NCBI Entrez Gene ID = CRKRS...
Mouse monoclonal antibody raised against a partial recombinant CRKRS. NCBI Entrez Gene ID = CRKRS...
Mouse monoclonal antibody raised against a partial recombinant PRKG1. NCBI Entrez Gene ID = PRKG1...
Mouse monoclonal antibody raised against a partial recombinant ACTN4. NCBI Entrez Gene ID = ACTN4...
Biology Products: